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Important Biostatistics and Epidemiology Equations Sensitivity = TP / (TP + FN) = true positives / disease
Important Biostatistics ... = Rule IN #Biostatistics ... #specificity #PPV ... #NPV
P-Value Significance - Visualized in number of "heads in a row" - Jonas Obleser, PhD - https://twitter.com/jonasobleser #PValues
Significance #heads #CoinFlip ... #Biostatistics
USMLE Epidemiology and Biostatistics Summary Meta-Analysis: pools data from several studies (greater power), limited by quality/bias of
Epidemiology and Biostatistics ... PPV: proportion ... prevalence is low, then PPV ... specificity -> higher PPV ... #Epidemiology #Biostatistics
Fungal Biomarkers: Comparing Beta-D-Glucan and Aspergillus Galactomannan Beta-D-Glucan: • Polysaccharide cell wall component of many fungi •
Spec -80% for IA, PPV ... < 50%, NPV > 90%
An Overview on P-Values "The widespread use of "statistical significance" (generally interpreted as "p <= 0.05") as
#PValues #BioStatistics
TYPE I & TYPE II ERRORS SENSITIVITY & SPECIFICITY = SNOUT & SPIN Sensitive Tests that
Type2 #Errors #Biostatistics
Sensitivity Specificity False-Positive False-Negative Contingency Table / confusion matrix Sensitivity refers to the test's ability to correctly
ConfusionMatrix #Biostatistics
Arterial Lines & Waveforms Arterial lines permit continuous invasive blood pressure measurement, frequent arterial blood sampling, and
PRESSURE VARIATION (PPV ... Pressure Variation (PPV ... volume (increased PPV
Sensitivity is the proportion of truly diseased persons in the screened population who are identified as
Calculation #Table #PPV ... #NPV #Formulas
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 Likelihood Ratios - Probability Remember 2/5/10 and 15/30/45: • LR of 2 increases the probability by 15%
LRs #diagnosis #biostatistics
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